The map gets stored on your AccessPort. You can reflash it back to your car at any point.
I thought at first that his dyno was "generous" but its not out of line compared to the DynoJet-esque numbers.
The thread youre talking about got confirmed with this one from Terry, saying that it certianly is possible to gain +140whp/wtq on an intake tune and e85.
http://www.1addicts.com/forums/showthread.php?t=758781
http://www.n54tech.com/forums/showthread.php?t=18643